Hue brush

[bruce1951]

I'm looking for some ideas. I have a photo that has a colour cast that I want to selectively desaturate. In this case yellow. I can select areas and make selection adjustments etc etc. But I simply want to 'brush away' the colour cast just in selected areas and control how much as I go.
I want to be able to control the colour, opacity, size etc. So to my mind if I could select a brush. Then the colour, I'm good to go.
I don't want to mess with layers. I really need fine control just to brush details and selected areas of various sizes.
I looked at filter brushes but I can't see a saturation option!!!

regards

[photoken]

We had a discussion about this a couple of years ago. See if the suggestions in this thread help you:
http://www.pl32.com/forum3/viewtopic.ph ... ate#p29290

[bruce1951]

Ken I got to Jane Fonda and forgot what I was reading about!!!!!!!!

Those steps may well work. But it's 'complicated'.

Here's what 'I' would like to see.
In the Filters Brush add a Hue/Saturation option. Then select Brush size and other options etc as per normal. Then user the Color Picker to select the color from the image. Then simply brush on or off with left or right buttons.

Creating layers etc still doesn't give the 'artist feel' of brushing on or off the selected color.

I can go to PSP and use the Hue/Saturation brush there but that still doesn't address a particular color.

regards

[photoken]

Hey Bruce,

Yes, the message thread I quoted offers 3 distinct ways to desaturate portions of an image by painting; and although the methods that use layers are complicated, they are definitely powerful and versatile.

The method I showed in my first example is the simplest one to paint saturation and de-saturation with a brush:

1. Choose the Paint tool.
2. In the Tool Settings for the Paint tool, use the "Channels" dropdown to select "HSV".
3. To the right of the dropdown, de-select the "H" and "V" buttons so that only "S" is active.
4. Set your foreground colour to a saturated colour like the full Red or the full Blue.
5. Set your background colour to an unsaturated colour like White.

Now, when you paint with the saturated colour, the areas will become more saturated; and when you paint with the unsaturated colour, the areas will become less saturated. You'll need to set the Intensity of the Paint tool to less than 30% to get a controllable result (I didn't want you to get distracted by Jane... ):

RW orig.jpg

RW desat.jpg

If you want to target a specific colour for painting, there's really no way to do that without first using the AutoMask tool (or the Tool...Color...Select Colors filter) to select the colour range you want:

RW targeted colour.jpg

P.S.: Your suggestion of a simple, dedicated Saturation brush with a colour target option makes sense.

[bruce1951]

Thanks Ken. But I prefer Jane!

With my issue I want to desaturate a specific colour. Rather than 'global' desaturation.

In the job I'm doing at the moment yellow is an issue. But I only want to desaturate in specific areas.
I'll keep experimenting and hope the 'smart' guys can see fit to include a Saturation brush option in a future upgrade.

regards

[Herbert123]

Thanks Ken. But I prefer Jane!

With my issue I want to desaturate a specific colour. Rather than 'global' desaturation.

In the job I'm doing at the moment yellow is an issue. But I only want to desaturate in specific areas.
I'll keep experimenting and hope the 'smart' guys can see fit to include a Saturation brush option in a future upgrade.

regards

Use the brush tool in HSV channel mode (Channels drop-down list in the tools properties), and turn off H and V. Then open the color editor, and switch to HSV mode. Use the S slider and set it to zero. Play with the intensity slider to control the desaturation strength while painting. Or set the S strength to 100 to increase the saturation in areas.

To select a range of colours to work on (while leaving others protected from any saturation changes) use the colour select tool (Tool-->Color-->Color Select).

Perhaps this would be an option?

I agree it would be handy to have a quick tool to do this. Even better, an additional option to control the colours which will be affected.

*Edit* Sorry Ken, I overlooked your post above. You already suggested the same method,

[photoken]

With my issue I want to desaturate a specific colour. Rather than 'global' desaturation.

In the job I'm doing at the moment yellow is an issue. But I only want to desaturate in specific areas.

I know you want to "paint" on the image; but FWIW, for that kind of adjustment I always prefer to make an accurate Lasso and use that to mask a Hue Editor adjustment layer (or a White Point adjustment layer). I realize that is not as "direct" as painting, but the control and flexibility it offers more than makes up for that, IMO.

To each his own.

[maxwell]

Hi,

to get similar results compared to Photoshop's saturation and desaturation tool you can apply Photoken's first proposal with an decrease of the intensity to about 45% in the tool settings. Decreasing the intensity of the brush you have a more sensitive control. In order to get a direct saturation or desaturation tool, please save your adjustments as a tool preset.

Cheers

Josef

[photoken]

It turns out that it can be even simpler: For the Paint tool, select "Saturation" as the Channel and leave all three RGB buttons selected. Painting with a saturated colour (like the pure blue) will increase the saturation and painting with an unsaturated colour (like white) will decrease the saturation. You will still have to significantly decrease the Intensity, as described, to get some semblance of control....

[photoken]

Bruce,

I had another thought.... If I correctly understand what you want to do -- reduce the yellow bias in certain areas -- you can try using the Brighten tool brush on the blue channel. I've used that approach when removing varied-colour lens flares.

[bruce1951]

Ken the example I'm using at the moment has yellow as the issue. Base/prime colours aren't such a problem. But if we could use the colour picker/eye dropper to pick a colour from the image then very accurate adjustments could be made. In my current edit it have areas, small areas, where I don't want the yellow. Just toning down some details is also beneficial. So zooming into 100-200% and changing just those areas would suit a brush action.

Hopefully the authors are reading this and think I'm a genius for coming up with an new idea!! If not maybe they will consider it anyway.

regards